Mars Sample Return: The Medium-Lift Approach
SpaceDaily

Debates over the best mission architecture for Apollo were intensive, and often quite heated. Fortunately, an appropriate solution for the time, budget and technology of the program was selected. Intensive planning paid off in a successful program. Today, a similar debate is taking place over a longer time scale with regard to Mars Sample Return. There is no precise timeline for the mission, and no exact budget for it either. However, NASA is still interested in carrying out the project, despite its recent troubles in reaching Mars.